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2,4,6‐Trimethylpyridine‐Derived Vinylene‐Linked Covalent Organic Frameworks for Confined Catalytic Esterification

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Knoevenagel condensation is a powerful tool for the construction of vinylene-linked covalent organic frameworks. Herein, we established a concise approach to vinylene-linked COFs by Knoevenagel condensation at the multi-methyl groups of a pyridine ring through in situ formation of N -acyl pyridinium cation in the presence of various acylating reagents. Following such a strategy, two vinylene-linked COFs were constructed using 2,4,6-trimethylpyridine and multi-aldehyde-substituted aromatic derivatives as monomers. The resultant COFs are highly crystalized into hexagonal lattices with specific surface areas as large as 1915 m 2 g -1 (vs. 1972 m 2 g -1 of theoretical value). The stable and abundant pyridine-decorated regular nanochannels within the COFs allow for catalyzing the esterification of several pharmaceutical intermediates with distinct spatially confined selectivity and recyclability, representing an environmentally friendly catalytic organic transformation.

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